JP6984409B2 - Resin gears - Google Patents

Description

The present invention relates to resin gears.

Resin gears are lightweight and have excellent quietness, and are widely used, for example, as gears for vehicles or industrial use. The resin gear includes an annular metal bush, an annular resin member provided around the metal bush and having teeth formed on the outer peripheral portion, and elasticity provided between the metal bush and the resin member. A resin gear provided with a member is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-15100

In the resin gear as described above, the metal bush and the elastic member and the resin member and the elastic member are reinforced by an adhesive. For example, the metal bush and the elastic member are joined by applying an adhesive to the outer peripheral surface of the metal bush and then attaching the elastic member to the metal bush. The adhesive is applied to the outer peripheral surface of the metal bush, but when the viscosity is low, the adhesive does not stay on the outer peripheral surface and may not be sufficiently filled between the metal bush and the elastic member. As a result, the joint strength between the metal bush and the elastic member may decrease.

One aspect of the present invention is to provide a resin gear capable of improving the joint strength with an elastic member.

The resin gear according to one aspect of the present invention includes an annular metal bush, an annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and the metal bush and the resin member. An annular elastic member provided between them is provided, and an adhesive portion made of an adhesive is provided between the metal bush and the elastic member and between the resin member and the elastic member, respectively, and the metal is provided. The outer peripheral surface of the bush facing the elastic member is rougher than the inner peripheral surface of the metal bush, and / or the inner peripheral surface of the resin member facing the elastic member is coarser than the other surfaces of the resin member. It is a face.

In the resin gear according to one aspect of the present invention, the outer peripheral surface of the metal bush and / or the inner peripheral surface of the resin member has a rough surface. As a result, in the resin gear, when the adhesive is applied to the outer peripheral surface and / or the inner peripheral surface, it is possible to prevent the adhesive from flowing down (dripping) from the outer peripheral surface and / or the inner peripheral surface. Therefore, in the resin gear, the adhesive is sufficiently filled between the metal bush and the elastic member and / or between the resin member and the elastic member. As a result, in the resin gear, the adhesive is sufficiently interposed between the metal bush and the elastic member and / or between the resin member and the elastic member, so that the bonding strength with the elastic member can be improved.

In one embodiment, irregularities may be continuously formed on the outer peripheral surface of the metal bush in the opposite direction of the pair of side surfaces of the metal bush. Generally, after the adhesive is applied to the outer peripheral surface of the metal bush, the metal bush is mounted so that one side surface of the metal bush is the mounting surface until the elastic member is attached to the metal bush. Placed. Therefore, by continuously forming the unevenness in the facing direction of the pair of side surfaces of the metal bush, it is possible to suppress the flow of the adhesive in the facing direction. Further, by forming unevenness on the outer peripheral surface of the metal bush, an anchor effect can be obtained at the bonded portion. Therefore, the joint strength between the metal bush and the elastic member can be further improved.

In one embodiment, irregularities may be continuously formed on the inner peripheral surface of the resin member in the opposite direction of the pair of side surfaces of the resin member. Generally, after the adhesive is applied to the inner peripheral surface of the resin member, the resin member is placed so that one side surface of the resin member becomes the mounting surface until the elastic member is attached to the resin member. .. Therefore, by continuously forming the unevenness in the facing direction of the pair of side surfaces of the resin member, it is possible to suppress the flow of the adhesive in the facing direction. Further, by forming unevenness on the inner peripheral surface of the resin member, an anchor effect can be obtained at the bonded portion. Therefore, the joint strength between the resin member and the elastic member can be further improved.

In one embodiment, the surface roughness Ra of the outer peripheral surface of the metal bush and / or the inner peripheral surface of the resin member may be 1.0 or more. In this configuration, the adhesive can be suitably fastened to the outer peripheral surface and / or the inner peripheral surface.

According to one aspect of the present invention, the joint strength with the elastic member can be improved.

FIG. 1 is a front view of a resin gear according to an embodiment. FIG. 2 is a diagram showing a cross-sectional structure taken along the line II-II in FIG. FIG. 3 is an enlarged view showing a part of FIG. 2. 4 (a) and 4 (b) are views showing a process of forming an elastic member.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIGS. 1 and 2, the resin gear 1 includes a metal bush 3, an elastic member 5, and a resin member 7. The resin gear 1 according to the present embodiment is a spur gear.

The metal bush 3 is a member attached to a rotating shaft (not shown). The metal bush 3 has an annular shape. The metal bush 3 is made of a metal such as stainless steel. The metal bush 3 is provided with a through hole 3h. The through hole 3h penetrates one side surface 3a and the other side surface 3b of the metal bush 3. A rotation shaft is inserted into the through hole 3h.

The metal bush 3 has an inner peripheral surface 4a and an outer peripheral surface 4b. The inner peripheral surface 4a defines a through hole 3h.

The outer peripheral surface 4b is a surface facing the elastic member 5. The outer peripheral surface 4b of the metal bush 3 is a rougher surface than the inner peripheral surface 4a. That is, the outer peripheral surface 4b has a rougher surface than the inner peripheral surface 4a. The outer peripheral surface 4b is roughened. Specifically, as shown in FIG. 3, the outer peripheral surface 4b is provided with irregularities. In the present embodiment, the unevenness is continuously formed in the direction in which one side surface 3a and the other side surface 3b of the metal bush 3 face each other. The unevenness is formed by, for example, phosphate coating treatment, laser processing, or the like. The surface roughness Ra (arithmetic mean roughness: JIS B 0601: 2001) of the outer peripheral surface 4b is 1.0 or more (Ra ≦ 1.0). The surface roughness Ra of the inner peripheral surface 4a is less than 1.0.

As shown in FIG. 1, the elastic member 5 is a member that attenuates an impact generated by meshing of a resin gear 1 with another gear. The elastic member 5 is annular. The elastic member 5 is provided around the metal bush 3. The elastic member 5 is provided between the metal bush 3 and the resin member 7. An adhesive portion 9 is interposed between the elastic member 5 and the metal bush 3. The metal bush 3 and the elastic member 5 are adhered to each other by the adhesive portion 9. The elastic member 5 may be configured by laminating a plurality of members (rubber layers). The thickness of the elastic member 5 is appropriately set.

The elastic member 5 is made of rubber. The rubber is butadiene rubber, chloroprene rubber, butyl rubber, styrene butadiene rubber, nitrile rubber, ethylene propylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, silicone rubber and the like. The rubber is preferably fluororubber or silicone rubber from the viewpoint of durability and heat resistance.

The resin member 7 is a member that meshes with other gears. The resin member 7 is annular. The resin member 7 is made of resin. The resin member 7 is provided around the elastic member 5. The resin member 7 has an inner peripheral surface 7a.

The inner peripheral surface 7a is a surface facing the elastic member 5. The inner peripheral surface 7a is a rougher surface than the other surfaces (in this embodiment, the side surfaces 7b and 7c). That is, the inner peripheral surface 7a has a rougher surface than the other surfaces. The inner peripheral surface 7a is roughened. Specifically, as shown in FIG. 3, the inner peripheral surface 7a is provided with irregularities. In the present embodiment, the unevenness is continuously formed in the direction in which one side surface 7b of the resin member 7 and the other side surface 7c face each other. The unevenness is formed by, for example, shot blasting, laser processing, cutting, or the like. The surface roughness Ra (arithmetic mean roughness: JIS B 0601: 2001) of the inner peripheral surface 7a is 1.0 or more (Ra ≦ 1.0).

An adhesive portion 11 is interposed between the elastic member 5 and the resin member 7. The elastic member 5 and the resin member 7 are adhered to each other by the adhesive portion 11.

As shown in FIG. 1, a tooth profile 8 is formed on the outer peripheral portion of the resin member 7. A plurality of tooth profiles 8 are formed at predetermined intervals in the circumferential direction of the resin member 7.

Subsequently, a method for manufacturing the resin gear 1 will be described. The manufacturing method of the resin gear 1 includes a bushing process, a manufacturing element forming process, a resin member forming process, a cutting process, a resin member processing process, an adhesive application process, an elastic member forming process, and teeth. Including the cutting process.

[Bush processing process]
In the bush processing step, the outer peripheral surface 4b of the metal bush 3 is processed. Specifically, for example, the outer peripheral surface 4b of the metal bush 3 is subjected to a phosphate coating treatment to form a phosphoric acid layer on the outer peripheral surface 4b. The phosphoric acid layer can be, for example, a zinc phosphate coating (composition containing zinc). Main component of zinc phosphate coating is hopeite _{(Zn 3 (PO 4) 2} · 4H 2 O) and phosphophyllite _{(Zn 2 Fe (PO 4)} 2 · 4H 2 O). The zinc phosphate film is treated with a treatment liquid containing phosphate ions and zinc ions as main components, and is formed by precipitating zinc. The thickness of the zinc phosphate coating is, for example, 2 μm to 3 μm. By forming the phosphoric acid layer on the outer peripheral surface 4b of the metal bush 3, unevenness is formed on the outer peripheral surface 4b. As a result, in the metal bush 3, the outer peripheral surface 4b becomes a rougher surface than the inner peripheral surface 4a. After processing the metal bush 3, the metal bush 3 is washed. Cleaning of the metal bush 3 may be performed before the adhesive application step.

[Paper machine forming process]
In the papermaking element forming step, an annular papermaking element is formed by the papermaking method. The papermaking element may contain only short fibers or may contain short fibers and a resin.

A conventionally known method can be applied to the formation of the papermaking element by the papermaking method. For example, the annular shape can be formed by using a cylindrical mold. Further, for the abstracted body, for example, a bush is placed in the center of the mold, a dispersion liquid of short fibers, a dispersion medium and an arbitrary resin is injected around the bush, and the dispersion medium is discharged from the mold, and then the cylinder is formed. It can be formed by compressing the aggregate remaining in the mold.

The melting point of the short fibers or the decomposition temperature of the short fibers is preferably 250 ° C. or higher. By using such short fibers, the short fibers do not cause thermal deterioration at the molding temperature or processing temperature at the time of molding and the atmospheric temperature at the time of actual use, and the fiber base material or the resin gear having excellent heat resistance can be obtained. can do.

As short fibers, para-aramid fiber, meta-aramid fiber, carbon fiber, glass fiber, boron fiber, ceramic fiber, ultra-high strength polyethylene fiber, polyketone fiber, polyparaphenylene benzobisoxazole fiber, total aromatic polyester fiber, It is preferable to use at least one type of short fiber selected from the polyimide fiber and the polyvinyl alcohol-based fiber. In particular, when a mixed fiber of a para-based aramid fiber and a meta-based aramid fiber is used as a short fiber, the balance between heat resistance, strength, and processability after resin molding is excellent.

As the slurry, an organic solvent, a mixture of an organic solvent and water, water or the like can be used. As the slurry, it is preferable to use water, which is particularly economical and has a low environmental load. When using an organic solvent, paying sufficient attention to safety, it is also possible to use an organic solvent such as methanol, ethanol, acetone, toluene, and diethyl ether.

The resin may be either a thermosetting resin or a thermoplastic resin, but is preferably a thermosetting resin from the viewpoint of improving the strength of the resin gear to be manufactured. More specifically, epoxy resin, polyaminoamide resin, phenol resin, unsaturated polyester resin, polyimide resin, polyether sulfone resin, polyether ether ketone resin, polyamideimide resin, polyamide resin, polyester resin, polyphenylene sulfide resin, A combination of one or more resins selected from polyethylene resin, polypropylene resin and the like and a curing agent according to the type of the selected resin can be used. Among these, the polyaminoamide resin is preferable from the viewpoint of the strength and heat resistance of the cured resin product, and the mixture 100 of 2,2'-(1,3 phenylene) bis2-oxazoline and an amine curing agent having excellent heat resistance and strength is 100. With respect to parts by mass, it is preferable to use, for example, a resin having n-octyl bromide of 5 parts by mass or less as a curing accelerator for the catalyst.

The resin may be made together with the short fibers in the papermaking element forming step, or may be impregnated into the papermaking element in the resin member forming step after forming the papermaking element containing only the short fibers.

[Resin member forming process]
In the resin member forming step, the papermaking element is placed in the mold and the resin is cured to form the resin member 7. When the resin is not used in the process of forming the paper machine, the resin is injected into the mold to impregnate the paper machine and then the resin is cured.

[Cutting process]
In the cutting process, the metal bush 3 and the resin member 7 are cut to adjust the dimensions. In the cutting process, each member is cut by a machine tool such as a lathe. Specifically, in the cutting process, the outer diameter portion and the inner diameter portion side surface of each member are cut, and each member is processed to a predetermined size.

[Resin member processing process]
In the resin member processing step, the inner peripheral surface 7a of the resin member 7 is processed. Specifically, for example, the inner peripheral surface 7a of the resin member 7 is subjected to shot blasting to form irregularities on the inner peripheral surface 7a. As a result, in the resin member 7, the inner peripheral surface 7a becomes a rougher surface than the side surfaces 7b and 7c. After the resin member processing step, the resin member 7 is washed. The cleaning of the resin member 7 may be performed before the adhesive application step.

[Adhesive application process]
In the adhesive application step, the adhesives A1 and A2 are applied to the metal bush 3 and the resin member 7, respectively. In the adhesive application step, the adhesive A1 is applied to the outer peripheral surface 4b of the metal bush 3. Further, in the adhesive application step, the adhesive A2 is applied to the inner peripheral surface 7a of the resin member 7. The adhesives A1 and A2 are vulcanized adhesives. As the vulcanization adhesive, for example, Chemlock 607 (manufactured by Lord Japan Inc.) can be used.

[Elastic member forming process]
In the elastic member forming step, the elastic member 5 is formed between the metal bush 3 and the resin member 7. As shown in FIG. 4A, the metal bush 3 and the outer peripheral surface 4b (adhesive A1) of the metal bush 3 and the inner peripheral surface 7a (adhesive A2) of the resin member 7 face each other. The resin member 7 and the resin member 7 are arranged in the molding die 20. Subsequently, as shown in FIG. 4B, the rubber material G is pushed into the injection portion 21 by the pushing member 22, and the rubber material G is inserted between the metal bush 3 and the resin member 7 via the injection portion 21. Inject. As a result, the rubber material G is filled between the metal bush 3 and the resin member 7. Then, the filled rubber material G is vulcanized and the rubber material G is heated. As a result, the elastic member 5 is formed between the metal bush 3 and the resin member 7. Further, by heating the adhesives A1 and A2, an adhesive portion 9 is formed between the metal bush 3 and the elastic member 5, and an adhesive portion 11 is formed between the resin member 7 and the elastic member 5. The elastic member 5 removes burrs and the like, if necessary.

[Tooth cutting process]
In the gear cutting process, the resin member 7 is geared. Applicable gear cutting includes finishing with a hobbing or shaving machine. As the hobbing board, for example, GE15A (trade name) manufactured by Mitsubishi Heavy Industries, Ltd. can be used. The cutting amount by the hobbing machine is 200 μm or more. As the shaving board, for example, FE30A (trade name) manufactured by Mitsubishi Heavy Industries, Ltd. can be used. The amount of cutting by shaving is small and is about 20 to 150 μm. The tooth profile 8 is formed on the resin member 7 by the gear cutting process.

The resin gear 1 is manufactured by the above steps.

As described above, in the resin gear 1 according to the present embodiment, the outer peripheral surface 4b of the metal bush 3 is a rougher surface than the inner peripheral surface 4a. That is, the outer peripheral surface 4b has a rougher surface than the inner peripheral surface 4a. Further, the inner peripheral surface 7a of the resin member 7 is a rougher surface than the other surfaces. That is, the inner peripheral surface 7a has a rougher surface than the other surfaces. As a result, in the resin gear 1, when the adhesives A1 and A2 are applied to the outer peripheral surface 4b and the inner peripheral surface 7a, the adhesives A1 and A2 flow down (hang down) from the outer peripheral surface 4b and the inner peripheral surface 7a. Can be suppressed. Therefore, in the resin gear 1, the adhesive A1 is sufficiently filled between the metal bush 3 and the elastic member 5, and the adhesive A2 is sufficiently filled between the resin member 7 and the elastic member 5. .. As a result, in the resin gear 1, since the adhesive portion 9 is sufficiently interposed between the metal bush 3 and the elastic member 5, the joint strength between the metal bush 3 and the elastic member 5 can be improved. Further, in the resin gear 1, since the adhesive portion 11 is sufficiently interposed between the resin member 7 and the elastic member 5, the joint strength between the resin member 7 and the elastic member 5 can be improved.

In the resin gear 1 according to the present embodiment, unevenness is continuously formed on the outer peripheral surface 4b of the metal bush 3 in the opposite direction of the pair of side surfaces 3a and 3b of the metal bush 3. Generally, after the adhesive A1 is applied to the outer peripheral surface 4b of the metal bush 3, one side surface 3a (3b) of the metal bush 3 is placed until the elastic member 5 is attached to the metal bush 3. The metal bush 3 is placed so as to be a surface. Therefore, by continuously forming the unevenness in the facing direction of the pair of side surfaces 3a (3b) of the metal bush 3, it is possible to suppress the flow of the adhesive A1 in the facing direction. Further, by forming unevenness on the outer peripheral surface 4b of the metal bush 3, an anchor effect can be obtained in the bonded portion 9. Therefore, the joint strength between the metal bush 3 and the elastic member 5 can be further improved.

In the resin gear 1 according to the present embodiment, unevenness is continuously formed on the inner peripheral surface 7a of the resin member 7 in the opposite direction of the pair of side surfaces 7b and 7c of the resin member 7. Generally, after the adhesive A2 is applied to the inner peripheral surface 7a of the resin member 7, one side surface 7b (7c) of the resin member 7 is the mounting surface until the elastic member 5 is attached to the resin member 7. The resin member 7 is placed so as to be. Therefore, by continuously forming the unevenness in the facing direction of the pair of side surfaces 7b (7c) of the resin member 7, it is possible to suppress the flow of the adhesive A2 in the facing direction. Further, by forming the unevenness on the inner peripheral surface 7a of the resin member 7, the anchor effect can be obtained in the adhesive portion 11. Therefore, the joint strength between the resin member 7 and the elastic member 5 can be further improved.

In the resin gear 1 according to the present embodiment, the surface roughness Ra of the outer peripheral surface 4b of the metal bush 3 and the inner peripheral surface 7a of the resin member 7 is 1.0 or more. In this configuration, the adhesive A1 can be suitably fastened to the outer peripheral surface 4b, and the adhesive A2 can be suitably fastened to the inner peripheral surface 7a.

Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

In the above embodiment, the embodiment in which the resin gear 1 is a spur gear has been described as an example. However, the resin gear 1 may be a helical gear or the like.

In the above embodiment, a mode in which the outer peripheral surface 4b of the metal bush 3 and the inner peripheral surface 7a of the resin member 7 are roughened will be described as an example. However, at least one of the outer peripheral surface 4b of the metal bush 3 and the inner peripheral surface 7a of the resin member 7 may be roughened.

In the above embodiment, a mode in which a phosphoric acid layer is formed on the outer peripheral surface 4b of the metal bush 3 by a phosphate coating treatment to form irregularities on the surface of the outer peripheral surface 4b has been described as an example. However, unevenness may be formed on the outer peripheral surface 4b of the metal bush 3 by laser processing, shot blasting, or the like. The method of forming the unevenness on the outer peripheral surface 4b is not limited.

In the above embodiment, an embodiment in which the inner peripheral surface 7a of the resin member 7 is subjected to shot blasting to form irregularities on the surface of the inner peripheral surface 7a has been described as an example. However, the method of forming the unevenness on the inner peripheral surface 7a is not limited.

In the above embodiment, the embodiment in which the outer peripheral surface 4b of the metal bush 3 and the inner peripheral surface 7a of the resin member 7 are processed to form irregularities on the outer peripheral surface 4b and the inner peripheral surface 7a has been described as an example. However, the unevenness may be formed on the outer peripheral surface 4b in the forming step of the metal bush 3 (casting or the like), or the unevenness may be formed on the inner peripheral surface 7a in the forming step of the resin member 7.

In the above embodiment, an embodiment in which irregularities are continuously formed on the outer peripheral surface 4b of the metal bush 3 in the opposite direction of the pair of side surfaces 3a and 3b of the metal bush 3 has been described. However, the outer peripheral surface 4b of the metal bush 3 may be at least a rougher surface than the inner peripheral surface 4a.

1 ... Resin gear, 3 ... Metal bush, 3a, 3b ... Side surface, 4a ... Inner peripheral surface, 4b ... Outer peripheral surface, 5 ... Elastic member, 7 ... Resin member, 7a ... Inner peripheral surface, 7b, 7c ... Side surface (Other surface), 8 ... tooth profile, 9 ... adhesive part, 11 ... adhesive part.

Claims (2)

An annular metal bush and
An annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and an annular resin member.
An annular elastic member provided between the metal bush and the resin member is provided.
An adhesive portion made of an adhesive is provided between the metal bush and the elastic member and between the resin member and the elastic member.
The outer peripheral surface facing the elastic member in the metal bushing is rough surface than the inner peripheral surface of the metal bushing,及beauty, an inner peripheral surface facing the elastic member in said resin member of said resin member Ri rough der than the other surface,
Concavities and convexities are continuously formed on the outer peripheral surface of the metal bush in the opposite direction of the pair of side surfaces of the metal bush.
A resin gear in which irregularities are continuously formed on the inner peripheral surface of the resin member in a direction facing the pair of side surfaces of the resin member. The resin gear according to claim 1, wherein the surface roughness Ra of the outer peripheral surface and / or the inner peripheral surface is 1.0 or more.

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